Plastic closure



FIG. 1 is a perspective view showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a first side elevational view;

FIG. 5 is a second side elevational view;

FIG. 6 is a top plan view; and,

FIG. 7 is a bottom plan view.

Any broken lines in the drawings depict probable environment only and form no part of the claimed design. 

The ornamental design for a “plastic closure,” as shown and described. 